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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 8
 2

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  flat topped.
  sinusoidal.
  pulsating.
 triangular.

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Electrical Machines
Sparkless commutation can be achieved by employing

  any one or more of the above methods.
  inter poles.
 compensating winding.
  high resistance carbon brushes.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  capacitor start.
  shaded pole type.
  capacitor run.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Closed slots.
  None of above.
  Open slots.
  Semi closed slots.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same frequency
 same phase sequence
 same voltage magnitude

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